Furnace or similar door.



No. 665,484. Patented 1an. 8,1901.A

I w E. s ToEF'FLEn. FuNAcE on SIMILAR nous.

(Applicatiqn' med 'seml 14, 1900.1 I -(Nu Model.) 2 Sheets-Sheet 2.

www a www m: Ncnms Prrms cc., Fumo-uma.. wAsmNu'mN. u, c.

Niets STATES PATENT Fries.

VVlLLlAM E. STOEFFLER, OF PHILADELPHIA, PENNSYLVANIA.

FURNAGE 0R SIMILAR oooR.

SPECIFICATION forming part of Letters Patent No. 665,484, dated Januarys, 1901'.

Application led September 14, 1900. Serial No. 30,024. (No model.)

To MZ whom t may concer-1c.-

Beit known that I, WILLIAM E. STOEFFLER, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inFurnace or Similar Doors-,of which the following is a speciflcation.

One of the objects of the present invention is to prolong the life offurnace and similar doors both With regard to the lining as well as themetal-Work, anda further object is to provide a door and its lockingattachment that will accomplish this end. This is accomplished by thenovel arrangement, construction, and combination of parts; and itconsists of the improvements hereinafter described, and pointed out inthe claims.

The nature, characteristic features, and scope of the invention will bemore fully understood from the following description, taken inconnection with the accompanying drawings, forming part hereof, and inWhich- Figure lis a front elevational view of a portion of an ovenhaving applied thereto a door embodying my invention. Fig. 2 is a frontelevational View of a door embodying the invention. Fig. 3 is a sideelevational vieW of the same. Fig. 4 is a sectional View taken on theline 4 4 of Fig. 2; and Fig. 5 is a View, partly in section and partlyin elevation, illustrating the door in open position.

In constructing furnace-doors it is customary to permit the metal-workon the insideof the door to extend into range of the intense heat of thefurnace or oven, as the case may be, the door of a railroad-locomotivefurnace being a good example. Exposure to such intense heat shortens thelife of doors and necessitates the constant renewal of the same. This ismost expensive, since the outside is usually in fair condition. Anothergreat disadvantage of the present type of furnacedoors is the constantbreaking of the firebrick which is carried on the inside of said doors.It is customary after tiring the furnace to slam the door shut bylmeausof a shovel. Such an operation, as is readily apparent, endsdisastrously to the lire-brick. In the drawings there is illustrated adoor suitable for application to a bakers oven, although it should beborne in mind that by the merest mechanical skill the shape maybealtered to accommodate itself to all forms of ovens or furnaces-forinstance, two doors might be hung side by side on the same casting orthe shape ofthe casting could be made round or oval. In fact, many Wayscould be employed to accomplish the same end.

Referring more particularly to Figs. l and 5, a is the oven, which isusually composed of masonry-Work. Secured to the oven by means of boltsor otherwise is a heavy casting comprising a door-frame d', provided onits face with seat c and with ears a2. Adoor a3, also of very heavymetal and provided with ears at, is attached to the framework by meansof a pin a5. This door a3 is open at its top, as at b, for the insertionof a block of fireproof composition, as {ire-brick c'. This is retainedby means of the anges b, that extend all around the inner face of thedoor. By reference to'Fig. 5 it will be noted that the edges of theanges b' are in alinement with the edges of the opening d i-n theframework ct and are adapted to abut on the doorseat c. It is thusapparent that the heat from the interior of the oven comes in directcontact with the tireproof composition and not With any of the metalparts of the door. Since the door is completely outside of the oven, itfollows that air circulates around the edges and all over the outside ofsaid door and thus counteracts to a great extent the tendency of theoven to heat the door.

Another feature of the door is the novel form of locking attachment.With reference now more especially to Figs. 2, 3, and 4, e is a bosscast on or secured to the framework ct. Pivotally mounted thereon is alever e of pe- 'culiar shape. As is plainly illustrated in Fig. 4, itvconsists of a single casting forming a series of angles terminating in ahandle e2. This lever is adapted to contact with an inclined or beveledprojection f, Fig. 3. Upon closing the door the lever is swung downwardon the inclined surface of the projection f, and upon pressure beingexerted upon said leveruthe door is securely fastened and the marginalflanges of the door and frame lare pressed together, and the morepressure exerted the tighter the door is fastened. It may be remarkedhere that such a construction is well adapted to furnace-doors, andparticularly to the above-recited door. Since the said door comes flushwith the inside of the furnace, it stands to reason that unless securelyfastened at all points flames and hot air would find their way to theexterior of the furnace.

g is used in connection with bakers ovens in order to support the upperportion of the framework, upon which the ash-pit doors are hung, thelower portion of said framework being secured in the usual manner. Thisis illustrated plainly in Fig. l.

It will be obvious to those skilled in the art to which the inventionrelates that modifications may be made in detail without departing fromthe spirit thereof. Hence I do not limit myself to the preciseconstruction and arrangement of parts hereinabove set forth andillustrated in the drawings; but,

Having thus described the nature and objects of the invention, what Iclaim as new, and desire to secure by Letters Patent, is-

1. A furnace or similar door comprising a metallic door-frame providedwith a door-seat adapted to be secured to the exterior of a furnace, adoor pivoted to the frame and having asingle pocket containing aheat-resisting inside facing surrounded by a marginal ange said flangebeing arranged to abut against said door-seat, and means for locking thedoor and pressing the angeagainst the marginal door-seat, substantiallyas described.

2. A furnace or similar door comprising a door-f rame provided with adoor-seat and having a clamping-lever, a door pivotally connected withthe door-frame and having a heatresisting inside facing surrounded by amarginal fiange said flange being arranged to abut against saiddoor-seat, and an inclined projection for said clampinglever arranged onthe door, whereb)v the locking of said door presses the flange againstthe door-seat, substantially as described.

In testimony whereof I have hereunto signed my name.

WVM. E. S"OEFFLER.

In presence of- W. J. JAGKSoN, K. M. GILLiGAN.

